MediaMonkey 4.x is the current version of MediaMonkey. If you are still using version 2.x / 3.x, you can just install the new version to your machine to upgrade, or if you want to test it out in parallel, you can install version 4 in 'Portable mode'.

Upgrading MediaMonkey 3 ---> 4:

Prior to upgrading, it is advisable to maintain your library (go to File > Maintain library, then check "Optimize database" in MediaMonkey 3.

Upon installing and running MediaMonkey 4, it will automatically import your library and most settings from MediaMonkey 3.x. BUT, you will lose your Gold functionality if you don't have a Lifetime or MediaMonkey 4 license (see 'Licensing' below).

If you've purchased the 'AAC Encoder Plugin' for MediaMonkey 3, it will only work with audio files and will not function with the Video functionality in MediaMonkey 4. It's therefore advisable to:

Uninstall the AAC Encoder Plugin

Install the new MediaMonkey Codec Pack

If you've customized the DB location in MediaMonkey 3, you'll have to manually reconfigure MediaMonkey 4's .ini file to point to the MM3 database.

If you run into database upgrade problems during upgrade and require MediaMonkey 3 to run File > Maintain Library you can find it here.

Licensing:

If you already own a MediaMonkey Gold license,

Lifetime License holders retain Gold functionality (there's no need for a new license).

Users who've purchased MediaMonkey Gold 3.x between November 1, 2010 and Nov. 15, 2011 should have received a free upgrade within a week of launch. If you haven't received your new license, submit a support request for your upgrade, and include your original purchase order number.

Other 3.x Gold License holders have received a coupon by email to the email registered with the purchase account offering a significant discount on an upgrade to MediaMonkey 4. If you haven't received a coupon, submit a support request for your upgrade, and include your original purchase order number.

MediaMonkey 2.x Upgrades:

If you're still using 2.x, it's advisable to upgrade to 3.x first, since 2.x --> 4.x upgrades are not officially supported. If the upgrade fails to locate your MediaMonkey 2.x database, you can manually upgrade as follows:

Go to the command prompt, and switch to C:\Program Files\MediaMonkey

Type dbupgrade.exe oldmm2.mdb newmm3.db where oldmm2.mdb is the location of the old database and newmm3 is the location of the new database. See the MediaMonkey wiki for more information about the database.